hi this is about calculating the mid points of an acid base titration. im lookin

Question

hi this is about calculating the mid points of an acid base titration. im looking for help finding the three mid points of the titration. one picture is the provided Ka constants of citric acid which is being tirated. please show all work thank you. THE QUESTION TO DIRECTLY BE ANSWERED IS QUESTION #3.

triprotic acid. Although its formula CoH807 nanca P hydrogens attached to the three carboxylic groups (CooH you will calculate 8 data point titration of 100 mL NaoH and then draw the grap Table 15.3 cid dissociation con ts of citric acid. 7.5 x 10-4 1.7 x 10-5 4.0 x 107 3,3 1. Acid dissociation: Start by writing the equations for t 2. citric acid. Make sure you give each species the corre Initial pH: Calculate the initial ph of the 0.50 M citric determined by Kan and the initial

Explanation / Answer

The midpoint of a titration occurs when the mol of the titrant added is equal to half the mol of the analyte.
This is when the concentration of the acid is equal to the base in the solution i.e) in ratio of 1:1.
That is the reason why PH = PKa = -log10[Ka]
PH = - log [ 7.5*10-4] = 3.124 at Ka1
PH = - log [1.7*10-5] = 4.124 at Ka2
PH = -log [ 4*10-7] = 6.39 at Ka2

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